string(270) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E7%9B%91%E7%90%86%E5%B7%A5%E7%A8%8B%E5%B8%88%E8%AE%B2%E4%B9%89%E7%AD%94%E6%A1%88%E8%A7%A3%E6%9E%90 => Failed to connect to 101.91.112.32 port 38195: Connection refused"
2020监理工程师讲义答案解析
